Abstract: A method for determining at least one lineal parameter of a transmission line comprises the following steps: determining at least one measurement of the complex propagation factor ? as a function of frequency on the basis of at least one measurement carried out on the transmission line, determining at least one measurement of the lineal attenuation ? of the transmission line equal to the real part of the measurement of the complex propagation factor ? and/or at least one measurement of the phase factor ? of the transmission line equal to the imaginary part of the measurement of the complex propagation factor ?, filtering the measurement of the lineal attenuation ? and/or the measurement of the phase factor ? on the basis of a polynomial frequency regression model dependent on the physical characteristics of the transmission line.

Abstract: A method for characterizing a segment of a transmission line, a reference signal being injected into the line and a time-domain measurement of the reflection of the reference signal in the line being carried out, the method comprises the following steps: applying a deconvoluting step to the time-domain measurement so as to generate a deconvoluted temporal sequence comprising a plurality of amplitude peaks each corresponding to an impedance discontinuity; removing, from the amplitude of at least one obtained peak, the contribution of at least one secondary reflection of the signal from an impedance discontinuity; deducing, from the temporal position of each peak, a position of an associated impedance discontinuity in the line segment; and deducing, from the amplitude of each peak, an estimate of the real part of the reflection coefficient of a wave reflected from each identified impedance discontinuity.

Abstract: A method for automatically measuring physical characteristics of a cable, comprises at least the following steps: positioning on said cable of means for creating an artificial singularity; the injection, at a point of said cable, of an electrical test signal; acquisition of said signal reflected on the singularities that said cable includes so as to produce a first reflectogram; measurement, on said reflectogram, of the temporal position ?t of the peak of the signal derived from its reflection on said artificial singularity; determination of the propagation velocity vp=2x/?t of the signal in said cable from the temporal position ?t and from the position x of said means for creating an artificial singularity on the cable.

Abstract: A method for characterizing a segment of a transmission line, a reference signal being injected into the line and a time-domain measurement of the reflection of the reference signal in the line being carried out, the method comprises the following steps: applying a deconvoluting step to the time-domain measurement so as to generate a deconvoluted temporal sequence comprising a plurality of amplitude peaks each corresponding to an impedance discontinuity; removing, from the amplitude of at least one obtained peak, the contribution of at least one secondary reflection of the signal from an impedance discontinuity; deducing, from the temporal position of each peak, a position of an associated impedance discontinuity in the line segment; and deducing, from the amplitude of each peak, an estimate of the real part of the reflection coefficient of a wave reflected from each identified impedance discontinuity.

Abstract: A method for determining at least one lineal parameter of a transmission line comprises the following steps: determining at least one measurement of the complex propagation factor ? as a function of frequency on the basis of at least one measurement carried out on the transmission line, determining at least one measurement of the lineal attenuation ? of the transmission line equal to the real part of the measurement of the complex propagation factor ? and/or at least one measurement of the phase factor ? of the transmission line equal to the imaginary part of the measurement of the complex propagation factor ?, filtering the measurement of the lineal attenuation ? and/or the measurement of the phase factor ? on the basis of a polynomial frequency regression model dependent on the physical characteristics of the transmission line.

Abstract: The reflectometry method for identifying at least one fault affecting a cable at at least one point, comprises: a step for estimating a parameter characteristic of the propagation of a signal within the cable, which include the attenuation ?(f), the phase factor ?(f), the reflection coefficient ?in(f) seen at the input of the cable from which is subtracted an estimate of the reflection coefficient in the absence of faults or a function, linear or non-linear, any of these parameters or a combination of parameters, the estimation being made as a function of the frequency of the signal based on a reflectogram of the signal, a step for transformation of the estimate of the parameter from the frequency domain into the time domain, a step for identification of the faults affecting the cable from the identification of the amplitude peaks of the estimate of the parameter transformed into the time domain.

Abstract: A method for automatically measuring physical characteristics of a cable, comprises at least the following steps: positioning on said cable of means for creating an artificial singularity; the injection, at a point of said cable, of an electrical test signal; acquisition of said signal reflected on the singularities that said cable includes so as to produce a first reflectogram; measurement, on said reflectogram, of the temporal position ?t of the peak of the signal derived from its reflection on said artificial singularity; determination of the propagation velocity vp=2x/?t of the signal in said cable from the temporal position ?t and from the position x of said means for creating an artificial singularity on the cable.

Abstract: The invention relates to a method and a device for analyzing electric cables in a network, for the detection and location of defects in networks comprising at least one junction from which there depart N secondary cable stretches. The method includes interposing in the network, in series at the input of each the secondary stretches (T2, T3) starting from the junction (A), a respective bidirectional passive filter (FR2,FR3) able to cut off a frequency band associated with this stretch. The filters all allow through the useful frequencies for the normal operation of the network. A pulsed test is applied to the input of the network signal modulated by N different carrier frequencies each situated in one of the N frequency bands of the filters. The temporal position of test signal spikes reflected for each of the N frequencies is detected, and deducing therefrom the position of possible defects on a stretch of cable of the network.

Abstract: The invention relates to a method and a device for analyzing electric cables in a network, for the detection and location of defects in networks comprising at least one junction from which there depart N secondary cable stretches. The method includes interposing in the network, in series at the input of each the secondary stretches (T2, T3) starting from the junction (A), a respective bidirectional passive filter (FR2,FR3) able to cut off a frequency band associated with this stretch. The filters all allow through the useful frequencies for the normal operation of the network. A pulsed test is applied to the input of the network signal modulated by N different carrier frequencies each situated in one of the N frequency bands of the filters. The temporal position of test signal spikes reflected for each of the N frequencies is detected, and deducing therefrom the position of possible defects on a stretch of cable of the network.

Abstract: The invention relates to an implantable pacemaker. This pacemaker comprises at least one conducting cable (11) electrically connecting a control box (10) to at least one electrode placed at a point in the patient's heart, the said control box (10) comprising a power supply system and an electronic system, and is characterised in that at least part of the said electronic system is remote from the control box (10) and is located at the at least one electrode to form an electrode module (13, 14a, 14b), the electrode module being placed on the outside surface of the heart.

Abstract: A chemical agent for improving the engineering properties of soil includes a mixture of cementitious pozzalans (5 to 60% by mass), calcium sulphate (20 to 80% by mass), an oxide of calcium (15 to 50% by mass) and silica oxide (1 to 30% by weight). Monofilament fibers can also be included in the mix.